This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 27 |
| 7 | 51 |
| 8 | 325 |
| 9 | 2193 |
| 10 | 3735 |
| 11 | 23709 |
| 12 | 35889 |
| 13 | 53835 |
| 14 | 589833 |
| 15 | 1294265 |
| 16 | 17291201 |
| 17 | 80719769 |
| 18 | 1274288105 |
| 19 | 23157444917 |
| 20 | 23635236877 |
| 21 | 230684552043 |
| 22 | 1218891196337 |
| 23 | 1722894010643 |
| 24 | 2544113575977 |
| 25 | 93096801594005 |
| 26 | 175482093541881 |
| 27 | 256924005422487 |
| 28 | 372295593308821 |